What is the primary goal of instrumentation and irrigation in primary endodontic therapy?

• A. To disinfect the canal system, remove debris, create a smooth path, and facilitate obturation.
• B. To widen canal to extreme sizes
• C. To avoid disinfection
• D. To minimize irrigation

Answer: (A)

The aim of instrumentation and irrigation in primary endodontic therapy is to thoroughly clean and disinfect the root canal system while shaping it to allow a solid, sealable fill. Mechanically, files and related tools remove infected pulp tissue, dentin debris, and the smear layer, creating a smooth, tapered canal path that can be obturated effectively. Chemically, irrigants flush out debris, dissolve organic tissue, and help disrupt biofilms, reaching areas that instruments can’t reach. This combination reduces the microbial load and prepares the canal so the filling material can be compacted and seal the space, preventing reinfection. Enlarging the canal to extreme sizes or avoiding disinfection would weaken tooth structure or leave bacteria behind, which is why those options don’t fit.